CN103632823A - Double-air-gap core electronic current transformer - Google Patents
Double-air-gap core electronic current transformer Download PDFInfo
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- CN103632823A CN103632823A CN201310657049.XA CN201310657049A CN103632823A CN 103632823 A CN103632823 A CN 103632823A CN 201310657049 A CN201310657049 A CN 201310657049A CN 103632823 A CN103632823 A CN 103632823A
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Abstract
The invention provides a double-air-gap core electronic current transformer. The double-air-gap core electronic current transformer comprises a first double-air-gap core and a second double-air-gap core; the first double-air-gap core is provided with a first air gap and a second air gap, and the connecting line between the first air gap and the second air gap passes through the circle center of the first double-air-gap core; the second double-air-gap core is connected in series with the first double-air-gap core and is coaxial with the first double-air-gap core, the second double-air-gap core is provided with a third air gap and a fourth air gap, and the connecting line between the third air gap and the fourth air gap passes through the circle center of the second double-air-gap core and is perpendicular to the connecting line between the first air gap and the second air gap; a conductor sequentially passes through the centers of the first double-air-gap core and the second double-air-gap core; a data processing chip is connected with coils of the first double-air-gap core and the second double-air-gap core and used for receiving measured data and displaying and outputting the measured data after converting the measured data from analog to digital.
Description
Technical field
The invention relates to electric power system instrument transformer technology, particularly, is about a kind of pair of air-gap iron core electronic current mutual inductor.
Background technology
Instrument transformer be guarantee that electric power system is normal, the visual plant of safety and reliability service.Through development for many years, instrument transformer has developed into electronic mutual inductor of today from traditional electromagnetic transformer, and core material has developed into nano-crystalline and amorphous material of today from initial ferrite.But existing current transformer can easily not carry out the measurement of charged installation at the scene.
Initial current transformer adopts iron core-closed, and along with the particularly rapid increase of Power System Shortcuts electric current of development of electric power system, iron core-closed saturation problem under large short circuit current is more and more outstanding.In order to improve this phenomenon; both at home and abroad researcher start to consider to use iron core with the current transformer of complete non magnetic air gap the protective current transformer, as electric power system; although this iron core with non magnetic air gap; but its whole core structure is all fixed; air gap is also completely fixed; make its workload in the process of transportation, installation and maintenance larger, inconvenience is carried out portable installation at the scene.
Common instrument transformer also has optical current mutual inductor, and it can reach very high accuracy in theory, but still rests on the stage of test and linked network trial run at present, to practical future development.Although it can adopt transducing head structure more flexibly, the birefringence problem of himself is difficult to solve, and when application, the extraneous factors such as ambient temperature and vibration are larger on accuracy of measurement impact, are difficult to be issued to high accuracy in severe field condition.
Summary of the invention
The main purpose of the embodiment of the present invention is to provide a kind of pair of air-gap iron core electronic current mutual inductor, to overcome above-mentioned two kinds of problems that instrument transformer exists.
To achieve these goals, the embodiment of the present invention provides a kind of pair of air-gap iron core electronic current mutual inductor, this pair of air-gap iron core electronic current mutual inductor comprises: first pair of air-gap iron core, on described first pair of air-gap iron core, the first air gap and interstice are set, the line of described the first air gap and interstice is through the center of circle of described first pair of air-gap iron core; Second pair of air-gap iron core, be connected in series with first pair of described air-gap iron core, and coaxial setting, the 3rd air gap and the 4th air gap are set on described second pair of air-gap iron core, the line of described the 3rd air gap and the 4th air gap is through the center of circle of described second pair of air-gap iron core, and perpendicular to the line of described the first air gap and interstice; Described conductor passes the center of described first pair of air-gap iron core and second pair of air-gap iron core successively; Described data processing chip connects the coil of described first pair of air-gap iron core and described second pair of air-gap iron core, for receiving measurement data, described measurement data is carried out showing and exporting after analog-to-digital conversion.
In one embodiment, in the both sides of above-mentioned air gap line, be wound with respectively multiturn coil, comprise: winding and secondary winding.
In one embodiment, above-mentioned data processing chip connects the secondary winding of described first pair of air-gap iron core and the secondary winding of described second pair of air-gap iron core.
Particularly, above-mentioned data processing chip comprises: analog to digital converter, carries out analog-to-digital conversion for the measurement data to described; Data storage, for compressing and store the measurement data after analog-to-digital conversion; Data show output module, for the measurement number to after analog-to-digital conversion, show and export, and realize the communication of data.
In one embodiment, above-mentioned pair of air-gap iron core electronic current mutual inductor also comprises: resistance, and the secondary winding of the two ends of described resistance and described first pair of air-gap iron core, and the secondary winding of described second pair of air-gap iron core connects.
The embodiment of the present invention also provides a kind of pair of air-gap iron core electronic current mutual inductor, this pair of air-gap iron core electronic current mutual inductor comprises: two air-gap iron cores, on described pair of air-gap iron core, the first air gap and interstice are set, the line of described the first air gap and interstice is through the center of circle of described pair of air-gap iron core; Described conductor is through the center of described pair of air-gap iron core; Described data processing chip connects the coil of described pair of air-gap iron core, for receiving measurement data, described measurement data is carried out showing and exporting after analog-to-digital conversion.
In one embodiment, in the both sides of above-mentioned air gap line, be wound with respectively multiturn coil, comprise: winding and secondary winding.
In one embodiment, above-mentioned data processing chip connects the secondary winding of described pair of air-gap iron core.
Particularly, above-mentioned data processing chip comprises: analog to digital converter, carries out analog-to-digital conversion for the measurement data to described; Data storage, for compressing and store the measurement data after analog-to-digital conversion; Data show output module, for the measurement number to after analog-to-digital conversion, show and export, and realize the communication of data.
In one embodiment, above-mentioned pair of air-gap iron core electronic current mutual inductor also comprises: resistance, the two ends of the secondary winding of the two ends of described resistance and described pair of air-gap iron core.
Beneficial effect of the present invention is, two air-gap iron core electronic current mutual inductors of the embodiment of the present invention, can carry out charged installation and removal easily, simultaneously at the scene, the structure of double-deck iron core possesses good measurement characteristics in large current range, and can improve certainty of measurement.In addition, two air-gap iron core electronic current mutual inductors of two core constructions can reduce eccentric throw error.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is according to the structural representation of two air-gap iron core electronic current mutual inductors of the embodiment of the present invention;
Fig. 2 is according to the structural representation of two air-gap iron cores of the embodiment of the present invention;
Fig. 3 is the relation curve changing with cross-sectional width according to the ratio of the iron-core coil of the embodiment of the present invention;
Fig. 4 is the relation curve changing with cross-sectional width according to the angular difference of the iron-core coil of the embodiment of the present invention;
Fig. 5 is according to the variation relation curve of the core section width of the embodiment of the present invention and weight;
Fig. 6 is the relation curve with iron core weight change according to the iron-core coil angular difference of the embodiment of the present invention;
Fig. 7 is according to the relation curve of the angular difference rate of descent of the Unit Weight iron core of the embodiment of the present invention and iron core weight;
Fig. 8 is according to the structural representation of two air-gap iron core electronic current mutual inductors of the embodiment of the present invention;
Fig. 9 is according to the angle between the eccentric throw of the embodiment of the present invention and air gap line and iron-core coil eccentric error change curve;
Figure 10 is according to the relation curve of the magneticdouble coil eccentric error of the embodiment of the present invention and eccentric throw and angle;
Figure 11 is according to the enlarged drawing of the relation curve of the magneticdouble coil eccentric error of the embodiment of the present invention and eccentric throw and angle.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of pair of air-gap iron core electronic current mutual inductor.Below in conjunction with accompanying drawing, the present invention is described in detail.
As shown in Figure 1, the embodiment of the present invention provides a kind of pair of air-gap iron core electronic current mutual inductor, and this pair of air-gap iron core electronic current mutual inductor comprises: conductor 1, two air-gap iron core 2 and data processing chip 4.
Wherein, conductor 1 is through the center of two air-gap iron cores 2.The symmetric position of this pair of air-gap iron core 2 is provided with two complete non magnetic air gaps: air gap 5 and air gap 6(are wherein, air gap 5 is blocked by conductor 1, therefore not shown in the drawings), this air gap 5 runs through this pair of air-gap iron core 2 with air gap 6, be the cross-sectional width that above-mentioned air gap 5 and the length of air gap 6 equal this pair of air-gap iron core 2, and the line of this air gap 5 and air gap 6 is through the center of circle (center) of this pair of air-gap iron core 2.Thus, make this pair of air-gap iron core 2 in fact can be divided into two semicircular structures, thereby conveniently carry out on the line charged installation and unloading.
As shown in Figure 2, in two semicircular structures part of above-mentioned two air-gap iron cores 2, be wound with respectively multiturn coil, this multiturn coil belongs to input according to it or output is divided into winding N one time
21and secondary winding N
22.
Above-mentioned data processing chip 4 connects respectively the two ends of the secondary winding of this pair of air-gap iron core 2, to receive the signal data being transmitted by this pair of air-gap iron core 2, and this signal data is processed.During concrete enforcement, this data processing chip 4 comprises: analog to digital converter 41, data storage 42 and data show output module 43.Analog to digital converter 41 is for measurement data is carried out to analog-to-digital conversion, thus the measurement data after T.G Grammar; Data storage 42 is for compressing and store the measurement data after analog-to-digital conversion; Data show that output module 43 shows and exports for the measurement number to after analog-to-digital conversion, realize the communication of data.
As shown in Figure 1, in a preferred embodiment, two air-gap iron core electronic current mutual inductors of the embodiment of the present invention also comprise a resistance, and the two ends of this resistance connect respectively the two ends of the secondary winding of this pair of air-gap iron core 2.
In sum, two air-gap iron core electronic current mutual inductors of the embodiment of the present invention, due to two symmetrically arranged air gaps that two air-gap iron cores wherein have, make two air-gap iron cores can be divided into two symmetrical semicircular structures, so that the installation and removal when practical application.
During concrete enforcement, need to, according to the demand of actual running environment, select two air-gap iron cores of different size, therefore, need to be optimized the parameter of above-mentioned two air-gap iron cores, so that it meets high-precision requirement better, below concrete parameter optimization method is described in detail.
First, according to the size of secondary winding current density, determine that secondary winding diameter is 1mm, then according to secondary winding around 6 layers, one deck 500 circles, determine that iron core interior diameter is 300mm.
Wide and the high ratio in the cross section of iron core generally, between 1:1.5～1:2, supposes that ratio is fixed on 1:2 and calculates, and the magnetic flux density in iron core is average.
Iron core interior diameter d
1=300mm, core section width is made as ε, iron core height h=2 ε, the overall diameter d of iron core
2=d
1+ ε, calculates above-mentioned each parameter of iron core below with the variation relation of core section width ε.
At core section width, ε changes in 20～100mm, and in the situation that air gap computational length is 2mm, as shown in Figure 3, the relation curve that the angular difference of iron-core coil changes with ε as shown in Figure 4 for the relation curve that the ratio that calculates iron-core coil changes with ε.From Fig. 3 and Fig. 4, can see that, after ε surpasses 40mm, the speed that ratio and angular difference decline is obviously slack-off.
When the width of core section increases, can make the weight of iron core increase accordingly, the variation relation curve of concrete cross-sectional width and weight is as shown in Figure 5.As can see from Figure 5,20 kilograms of the less than of the weight of iron core during from cross-sectional width 30mm approach 200 kilograms during to cross-sectional width 100mm, those of ordinary skills should know, in general test, seldom can use weight is the iron core of 200 kilograms, so needs further reasonably to design the weight of iron core.Draw thus angular difference with the relation curve of iron core weight change, as shown in Figure 6.
As can see from Figure 6, after the weight of iron core surpasses 40 kilograms, the speed that angular difference declines with iron core weight is obviously slack-off.In order more reasonably to determine the scope of iron core weight, can further calculate again and increase the angular difference rate of descent of Unit Weight iron core and the relation of iron core weight, as shown in Figure 7.As can see from Figure 7, after the weight of iron core surpasses 20 kilograms, it is low-down increasing the angular difference decline income that iron core weight can bring, and with 20 kilograms to compare gap before very obvious.Draw thus, the weight of iron core should be controlled in 20 kilograms.As can see from Figure 5, Weight control within 20 kilograms, the width of core section corresponding being controlled in 35mm so.
According to above-mentioned calculating and analysis result, can obtain a preferably iron core Optimal Parameters: interior diameter is 300mm, overall diameter is 370mm, is highly 60mm.It should be noted that, above-mentioned optimization method is only the process of carrying out parameter optimization for two air-gap iron cores that illustrates, and not in order to limit the specification of two air-gap iron cores of the embodiment of the present invention.
In two air-gap iron core structures of the embodiment of the present invention, due to the existence at two non magnetic air gaps, at these two non magnetic air gap places, have the breach of coil, therefore can not realize complete distributed winding, the eccentric throw defection producing produces error, and this is eccentric throw error.Meanwhile, in the situation of repeatedly installing at the scene, be also difficult to guarantee that Primary Conductor passes from hub of a spool accurately.Therefore, in embodiments of the present invention, eccentric throw error has been carried out to theoretical calculating, calculated the degree of eccentricity (ratio of eccentric distance and iron core inside radius) and be respectively 0.1,0.2,0.3,0.4,0.5 o'clock, eccentric error is with the variation relation of angle between eccentric throw and air gap line.Angle between eccentric throw and air gap line, the eccentric throw of take is zero angle on air gap line time, the eccentric error change curve when calculating this angle and changing between 0～90 ° of scope, as shown in Figure 8.As can see from Figure 8, due to the existence of air gap, may cause the structure of single pair of air-gap iron core of the embodiment of the present invention to have certain eccentric error.
As shown in Figure 8, eccentric error has the region of obvious positive error and negative sense error, and the order of magnitude gap of the eccentric distance error in two regions is little, therefore, can consider the mode of the positive error region of two air-gap iron core coil eccentric distance errors and the stack of negative sense error band to reduce error, for this reason, in embodiments of the present invention, inventor is on the basis of single pair of air-gap iron core, two air-gap iron core electronic current mutual inductors to the embodiment of the present invention are improved further, proposed a kind of by the current transformer of two two air-gap iron core series connection.
Fig. 9 is according to the structural representation of two air-gap iron core electronic current mutual inductors of the embodiment of the present invention, and as shown in Figure 9, this pair of air-gap iron core electronic current mutual inductor comprises: conductor 1, two air-gap iron core 2, two air-gap iron core 3, data processing chip 4.
Wherein, conductor 1 passes the center of two air-gap iron cores 2 and two air-gap iron core 3 successively; Two air-gap iron cores 2 are connected in series with two air-gap iron cores 3, and to take both circle center line connecting be the coaxial setting of axle.As shown in Figure 9, there are two complete non magnetic air gaps in the symmetric position at two air-gap iron cores 2: air gap 5 and air gap 6, this air gap 5 runs through this pair of air-gap iron core 2 with air gap 6, and the line of this air gap 5 and air gap 6 is through the center of circle of this pair of air-gap iron core 2, thus, make this pair of air-gap iron core 2 in fact can be divided into two symmetrical parts, thereby conveniently carry out on the line charged installation and unloading.Similarly, there are two complete non magnetic air gaps in the symmetric position at two air-gap iron cores 3: air gap 7 and air gap 8(are wherein, air gap 8 is blocked by conductor 1, therefore not shown in the drawings), this air gap 7 runs through this pair of air-gap iron core 3 with air gap 8, the line of this air gap 7 and air gap 8, through the center of circle of this pair of air-gap iron core 3, makes this pair of air-gap iron core 3 in fact can be divided into two symmetrical parts, thereby conveniently carries out on the line charged installation and unloading.
As seen from Figure 9, in the structure of two two air-gap iron cores, the position relationship of two two air-gap iron cores is: two two parallel placements of air-gap iron core, and the air gap line of two two air-gap iron cores is mutually vertical.Under this position relationship, the negative sense error band of the positive error region of two air-gap iron cores 2 and two air-gap iron cores 3 is overlapping, the positive error region overlapping of the negative sense error band of two air-gap iron cores 2 and two air-gap iron cores 3.When Primary Conductor is during in an eccentric position, the counteracting that its eccentric distance error producing in two two air-gap iron cores can produce certain degree.
In addition, due to two symmetrically arranged air gaps that each two air-gap iron core has, make two air-gap iron cores can be divided into two symmetrical semicircular structures, so that the installation and removal when practical application.
Calculate eccentricity ratio and be respectively 0.1,0.2,0.3,0.4,0.5 o'clock, the eccentric error of angle when changing for 0～90 °, obtains the relation of eccentric error and eccentric throw and angle in two air-gap iron cores as shown in figure 10.Comparison diagram 8 and Figure 10 are known, and when two two air-gap iron cores are set, the eccentric error of the loop construction being comprised of two two air-gap iron cores is less than the eccentric error of single pair of air-gap iron core structure, and eccentricity ratio is that the maximum eccentric error of 0.3 o'clock has been less than 0.1%.The precision of the iron core of expecting in consideration practical application and actual eccentric throw situation, amplify the situation of 0.1,0.2 and 0.3 these three kinds of eccentricity ratios further and observe, as shown in figure 11.
If as can see from Figure 11 can be by the Eccentricity control of a current－carrying conductor in 0.2, eccentric error be very little so, is less than 0.01%, if by Eccentricity control in 0.3, the eccentric error producing is so less than 0.05%.Now, iron core interior diameter is 300mm, the corresponding eccentric throw 30mm of eccentricity ratio 0.2, the corresponding eccentric throw 45mm of eccentricity ratio 0.3.
By above analysis and calculation process, can be found out, by adopting the structure of two two air-gap iron cores of the embodiment of the present invention, can reduce well the eccentric distance error of two air-gap iron core coils.
As shown in Figure 9, the two ends of above-mentioned data processing chip 4 connect respectively at the coil of above-mentioned pair of air-gap iron core 2 and above-mentioned pair of air-gap iron core 3.During concrete enforcement, data processing chip 4 is connected respectively (not shown) with two secondary winding of air-gap iron core 2 and the secondary winding of two air-gap iron core 3.This data processing chip 4 is for receiving measurement data, and measurement data is carried out showing and exporting after analog-to-digital conversion.Particularly, above-mentioned data processing chip 4 comprises: analog to digital converter 41, data storage 42 and data show output module 43.
Wherein, above-mentioned analog to digital converter 41 carries out analog-to-digital conversion for the measurement data of the secondary winding output to from two air-gap iron cores; Data storage 42 is for compressing and store the measurement data after analog-to-digital conversion; Data show that output module 43 shows and exports for the measurement number to after analog-to-digital conversion, thereby realize the communication of data.
In a preferred embodiment, as shown in Figure 9, above-mentioned two air-gap iron core electronic current mutual inductors also comprise: be connected to the resistance between above-mentioned pair of air-gap iron core 2, two air-gap iron core 3 and data processing chip 4, the two ends of this resistance are connected (not shown) with the secondary winding of two air-gap iron cores 2 and the secondary winding of two air-gap iron core 3 respectively.
In sum, a kind of electronic current mutual inductor that uses two air-gap iron cores of the embodiment of the present invention, can carry out charged installation and removal easily at the scene.Theoretical according to the basic principle of current transformer and air-gap iron core, in conjunction with the calculating of air-gap iron core error, for two air-gap iron core ratios and the large feature of angular difference, in order reasonably to determine iron core parameter, improve ratio and angular difference situation, carried out two air-gap iron core errors and calculated.Under different gas lengths, two air-gap iron core coils are carried out to accuracy testing, according to result of the test, summed up the ratio of two air-gap iron core coils and the rule that angular difference changes with gas length.
Simultaneously, in order to improve the large feature of eccentric throw error of iron core, the embodiment of the present invention has been carried out theoretical calculating in conjunction with actual conditions, according to the feature of single iron-core coil eccentric throw error, determined double-iron core structure, and verified that by calculation and test this double-iron core structure can improve certainty of measurement preferably.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method can come the hardware that instruction is relevant to complete by program, this program can be stored in a computer read/write memory medium, such as ROM/RAM, magnetic disc, CD etc.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. two air-gap iron core electronic current mutual inductors, is characterized in that, described pair of air-gap iron core electronic current mutual inductor comprises:
First pair of air-gap iron core, arranges the first air gap and interstice on described first pair of air-gap iron core, and the line of described the first air gap and interstice is through the center of circle of described first pair of air-gap iron core;
Second pair of air-gap iron core, be connected in series with first pair of described air-gap iron core, and coaxial setting, the 3rd air gap and the 4th air gap are set on described second pair of air-gap iron core, the line of described the 3rd air gap and the 4th air gap is through the center of circle of described second pair of air-gap iron core, and perpendicular to the line of described the first air gap and interstice;
Described conductor passes the center of described first pair of air-gap iron core and second pair of air-gap iron core successively;
Described data processing chip connects the coil of described first pair of air-gap iron core and described second pair of air-gap iron core, for receiving measurement data, described measurement data is carried out showing and exporting after analog-to-digital conversion.
2. according to claim 1 pair of air-gap iron core electronic current mutual inductor, is characterized in that, in the both sides of described air gap line, is wound with respectively multiturn coil, comprising: winding and secondary winding.
3. according to claim 2 pair of air-gap iron core electronic current mutual inductor, is characterized in that, described data processing chip connects the secondary winding of described first pair of air-gap iron core and the secondary winding of described second pair of air-gap iron core.
4. according to claim 3 pair of air-gap iron core electronic current mutual inductor, is characterized in that, described data processing chip comprises:
Analog to digital converter, carries out analog-to-digital conversion for the measurement data to described;
Data storage, for compressing and store the measurement data after analog-to-digital conversion;
Data show output module, for the measurement number to after analog-to-digital conversion, show and export, and realize the communication of data.
5. according to claim 4 pair of air-gap iron core electronic current mutual inductor, it is characterized in that, described pair of air-gap iron core electronic current mutual inductor also comprises: resistance, the two ends of described resistance are connected with the secondary winding of described first pair of air-gap iron core and the secondary winding of described second pair of air-gap iron core.
6. two air-gap iron core electronic current mutual inductors, is characterized in that, described pair of air-gap iron core electronic current mutual inductor comprises:
Two air-gap iron cores, arrange the first air gap and interstice on described pair of air-gap iron core, and the line of described the first air gap and interstice is through the center of circle of described pair of air-gap iron core;
Described conductor is through the center of described pair of air-gap iron core;
Described data processing chip connects the coil of described pair of air-gap iron core, for receiving measurement data, described measurement data is carried out showing and exporting after analog-to-digital conversion.
7. according to claim 6 pair of air-gap iron core electronic current mutual inductor, is characterized in that, in the both sides of described air gap line, is wound with respectively multiturn coil, comprising: winding and secondary winding.
8. according to claim 7 pair of air-gap iron core electronic current mutual inductor, is characterized in that, described data processing chip connects the secondary winding of described pair of air-gap iron core.
9. according to claim 8 pair of air-gap iron core electronic current mutual inductor, is characterized in that, described data processing chip comprises:
Analog to digital converter, carries out analog-to-digital conversion for the measurement data to described;
Data storage, for compressing and store the measurement data after analog-to-digital conversion;
Data show output module, for the measurement number to after analog-to-digital conversion, show and export, and realize the communication of data.
10. according to claim 9 pair of air-gap iron core electronic current mutual inductor, is characterized in that, described pair of air-gap iron core electronic current mutual inductor also comprises: resistance, the two ends of described resistance are connected with the two ends of the secondary winding of described pair of air-gap iron core.
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| CN106093511A (en) * | 2016-08-26 | 2016-11-09 | 三峡大学 | A kind of iron-core coil high-precision electronic insertion current transformer containing air gap |
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| CN108802467A (en) * | 2018-05-04 | 2018-11-13 | 国网浙江宁波市奉化区供电有限公司 | A kind of iron core line ring type current transformer and earth detector that accuracy of detection is high |
| CN110426548A (en) * | 2019-02-25 | 2019-11-08 | 云南电网有限责任公司红河供电局 | It is a kind of for running the high-voltage great-current measuring device with electricity for doing anti-defect diagonsis |
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| CN106160150A (en) * | 2016-08-24 | 2016-11-23 | 深圳市惠立智能电力科技有限公司 | The power control system of a kind of adaptive CT sensing power taking and method thereof |
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| CN106093511B (en) * | 2016-08-26 | 2023-10-27 | 三峡大学 | High-precision electronic current transformer with iron core coil containing air gap |
| CN108802467A (en) * | 2018-05-04 | 2018-11-13 | 国网浙江宁波市奉化区供电有限公司 | A kind of iron core line ring type current transformer and earth detector that accuracy of detection is high |
| CN108802467B (en) * | 2018-05-04 | 2023-12-29 | 国网浙江省电力有限公司宁波市奉化区供电公司 | Iron core coil type current transformer with high detection precision and electric leakage detection device |
| CN110426548A (en) * | 2019-02-25 | 2019-11-08 | 云南电网有限责任公司红河供电局 | It is a kind of for running the high-voltage great-current measuring device with electricity for doing anti-defect diagonsis |
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